Overriding an animation?

Hi! Can someone PLEASE explain to me as simply as possible how to replace a sims 4 animation with another sims 4 animation? I want to replace the one when sims are passing out and falling on their faces with death by steam animation (but without the sim actually dying xd). I beg you please help it drives me insane!

ps sorry if I made any mistakes, I'm still learning english.